C550 at FL450 with ZNY fails to comply with accepted crossing restr during descent.

Attributes
ACN	637733
Time
Date	200411
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : dny.vor
State Reference	NY
Altitude	msl bound lower : 29000 msl bound upper : 45000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 100 flight time total : 8800 flight time type : 1000
ASRS Report	637733
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : overrode automation
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

At approximately XA55 I left the left seat to answer nature prior to our descent into hpn. The other pilot donned his mask and I had the flight mechanic stay in the cockpit. Between XA55 and XB00, the other pilot copied a clearance to descend to FL290 (we were at FL450) by a point 110 NM west of dny. We were probably within 50 NM of this point which makes it a touch goal anyway. The other pilot decided to utilize the VNAV feature and showed the mechanic jumpseater how to set it up in the box. When I returned to my seat, I asked if there were any changes and was told of the altitude requirement and that it was 'set up in the box.' I immediately noted that we were already at a point 108 NM west of dny (and closing). I started a rapid descent and instructed the other pilot to announce our intentions to ATC just as ATC called us. There were no conflicts and ATC assured us we would be fine due to our rapid descent rate.

Original NASA ASRS Text

Title: C550 AT FL450 WITH ZNY FAILS TO COMPLY WITH ACCEPTED XING RESTR DURING DSCNT.

Narrative: AT APPROX XA55 I LEFT THE L SEAT TO ANSWER NATURE PRIOR TO OUR DSCNT INTO HPN. THE OTHER PLT DONNED HIS MASK AND I HAD THE FLT MECH STAY IN THE COCKPIT. BTWN XA55 AND XB00, THE OTHER PLT COPIED A CLRNC TO DSND TO FL290 (WE WERE AT FL450) BY A POINT 110 NM W OF DNY. WE WERE PROBABLY WITHIN 50 NM OF THIS POINT WHICH MAKES IT A TOUCH GOAL ANYWAY. THE OTHER PLT DECIDED TO UTILIZE THE VNAV FEATURE AND SHOWED THE MECH JUMPSEATER HOW TO SET IT UP IN THE BOX. WHEN I RETURNED TO MY SEAT, I ASKED IF THERE WERE ANY CHANGES AND WAS TOLD OF THE ALT REQUIREMENT AND THAT IT WAS 'SET UP IN THE BOX.' I IMMEDIATELY NOTED THAT WE WERE ALREADY AT A POINT 108 NM W OF DNY (AND CLOSING). I STARTED A RAPID DSCNT AND INSTRUCTED THE OTHER PLT TO ANNOUNCE OUR INTENTIONS TO ATC JUST AS ATC CALLED US. THERE WERE NO CONFLICTS AND ATC ASSURED US WE WOULD BE FINE DUE TO OUR RAPID DSCNT RATE.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.